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The spin structure and spin dynamics of excitons in an ensemble of(In,Al)As/AlAs quantum dots (QDs) with type-I band alignment, containing bothdirect and indirect band gap dots, are studied. Time-resolved and spectralselective techniques are used to distinguish between the direct and indirectQDs. The exciton fine structure is studied by means of optical alignment andoptical orientation techniques in magnetic fields applied in the Faraday orVoigt geometries. A drastic difference in emission polarization is found forthe excitons in the direct QDs involving a $\Gamma$-valley electron and theexcitons in the indirect QDs contributed by an $X$-valley electron. We showthat in the direct QDs the exciton spin dynamics is controlled by theanisotropic exchange splitting, while in the indirect QDs it is determined bythe hyperfine interaction with nuclear field fluctuations. The anisotropicexchange splitting is determined for the direct QD excitons and compared withmodel calculations.

Optical orientation and alignment of excitons in direct and indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment